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arXiv 1107.2771quant-ph
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利用光子相减和相加的相干叠加增强连续变量的量子纠缠

Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition

Su-Yong Lee, Se-Wan Ji, Ho-Joon Kim, Hyunchul Nha

摘要:

我们研究了如何通过在每个模式上执行由Lee和Nha [Phys.Rev.A82,053812(2010)]提出的光子减法和加法的相干叠加操作来改善双模态的纠缠特性。结果表明,对双模压缩态进行相干操作,可以提高输出态的纠缠度、EPR型关联以及量子隐形传态的性能。特别是在小压缩区,相干操作的效果比单纯的光子相减和光子相加的效果更显著,而在大压缩区,最佳操作变成光子相减。

英文摘要:

We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. A 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the EPR-type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction and the addition particularly in the small squeezing regime, whereas the optimal operation becomes the photon subtraction in the large-squeezing regime.

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